77696669 has 2 divisors, whose sum is σ = 77696670. Its totient is φ = 77696668.

The previous prime is 77696621. The next prime is 77696677. The reversal of 77696669 is 96669677.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73736569 + 3960100 = 8587^2 + 1990^2 .

It is a cyclic number.

It is not a de Polignac number, because 77696669 - 2¹⁶ = 77631133 is a prime.

It is a super-2 number, since 2×77696669² = 12073544747391122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77696609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38848334 + 38848335.

It is an arithmetic number, because the mean of its divisors is an integer number (38848335).

Almost surely, 2^77696669 is an apocalyptic number.

It is an amenable number.

77696669 is a deficient number, since it is larger than the sum of its proper divisors (1).

77696669 is an equidigital number, since it uses as much as digits as its factorization.

77696669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5143824, while the sum is 56.

The square root of 77696669 is about 8814.5714019458. The cubic root of 77696669 is about 426.7112897529.

The spelling of 77696669 in words is "seventy-seven million, six hundred ninety-six thousand, six hundred sixty-nine".